JPH0854967A - Battery connecting device for computer and changeover methodof battery - Google Patents

Abstract

PURPOSE: To prolong the operation time of a computer by a battery. CONSTITUTION: Plural series circuits 26 and 28 connected to individual battery packs 30 and 34 for supplying power to a computer main body are provided. The series circuits 26 and 28 are constituted by connecting the drains of a pair of field effect transistors provided with diodes where anodes are connected to sources and cathodes are connected to the drains. For supplying power from the battery pack 30, FET11 and FET12 are turned on, FET21 and FET22 are turned off and power is supplied without the aid of the diodes D11 and D12. Then, FET11 is turned off, FET22 is turned on, FET12 is turned off and FET21 is turned on in order from such state and power is supplied from the battery pack 34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery connecting device for a computer and a battery switching method, and more particularly, to a battery connecting device for a computer in which loss of power due to a diode is prevented and a battery-operated operation time is extended. The present invention relates to a battery switching method.

[0002]

2. Description of the Related Art Generally, a notebook computer is equipped with a battery pack (hereinafter, referred to as a battery), and a user operates the computer on a battery in a place without an AC power source. Normally, in a notebook computer equipped with a color liquid crystal display, it takes about 3 hours to operate the battery from full charge. However, a fully charged battery with an operating time of 3 hours does not necessarily mean that the user is satisfied with the operating time.

Therefore, conventionally, a notebook computer equipped with two batteries has been proposed.

FIG. 1 shows a battery which is the basis of the present invention.
It shows a battery connecting device for a notebook computer mounted individually. The first battery 10 is connected to an input end of a DC / DC converter 14 for supplying power to a computer via a diode 12 connected in the forward direction. The second battery 16 is also connected to the DC / D via the diode 18 which is also connected in the forward direction.
It is connected to the input terminal of the C converter 14. As a result, the first battery 10 and the second battery 16 are DC / D
It is diode-or connected to the C converter 14. Due to the diode-or connection as described above, there is a potential difference between the first battery 10 and the second battery 16, and a large current flows between the first battery 10 and the second battery 16, and the components between the batteries are connected. , The wiring pattern or the battery itself is prevented from being destroyed.

By connecting the two batteries in this manner, the first battery 10 or the second battery 16 to the diode 12 or the diode 18, and the DC / D are connected.
Electric power is supplied to the computer main body through the C converter 14.

An AC / DC adapter 20 for converting AC into DC is connected between the first battery 10 and the diode 12 via a first charging switch 22 and a second charging switch 24. Via the second battery 1
A charging path that is connected between 6 and the diode 18 and that is different from the power supply path that supplies power via the DC / DC converter 14 is provided. By this charging route,
The first battery 10 or the second battery 16 can be charged, and the diode 12 or the diode 1 can be charged.
8 and power can be supplied to the computer main body via the DC / DC converter 14.

[0007]

However, the conventional battery connecting device for a computer has a problem that the power is supplied from the battery through the diode, so that the power loss due to the diode is large. For example,
One battery capacity is 30 WH (two 60 WH), battery voltage is 10.6V, diode Vf is 0.6V,
Assuming that the power consumption of the computer is 10 W, the current flowing through the diode is 10 / (10.6-0.6) = 1.
[A] is reached, and the battery operating time is 60 WH / (10
W + 0.6W × 1A) = 5.66 hours.

Further, since the charging path different from the power supply path is provided, there is a problem that the structure becomes complicated.

The present invention has been made to solve the above problems, and provides a battery connecting device for a computer and a battery switching method capable of eliminating the power loss due to the diode and prolonging the operating time by battery driving. The purpose is to do. Another object of the present invention is to provide a battery connecting device for a computer, which has a simple structure by sharing a power supply path and a charging path.

[0010]

In order to achieve the above object, the invention of claim 1 is such that a first switching element whose input side is connectable to a battery and an anode are connected to the input side of the first switching element. A first circuit having a first diode whose cathode is connected to the output side of the first switching element, and an input side connected to the output side of the first switching element and an output side for supplying power to the computer body. And a second diode having a cathode connected to the input side of the second switching element and an anode connected to the output side of the second switching element. A plurality of series circuits each including a second circuit are provided.

According to a second aspect of the present invention, there is provided a battery connecting device for a computer, comprising a plurality of series circuits each of which can be connected to a separate battery for supplying electric power to the computer main body. With 1
It is characterized in that the drains of the pair of field effect transistors are connected to each other.

According to a third aspect of the present invention, a first switching element whose input side is connectable to a battery and an anode are connected to the input side of the first switching element, and a cathode is the first.
A first circuit having a first diode connected to the output side of the switching element, and an input side connected to the output side of the first switching element and an output side supplying power to the computer body. A second diode comprising a connected second switching element and a second diode whose cathode is connected to the input side of the second switching element and whose anode is connected to the output side of the second switching element.
A battery switching method for connecting a battery to each of the series circuits of a battery connection device for a computer having a pair of series circuits consisting of the above circuit and switching from one battery to the other battery. In a state in which power is supplied to the computer main body via the first switching element and the second switching element of the series circuit of, power is supplied to the computer main body from both batteries via the first diode, The power supply from the one battery to the computer main body is stopped, and the power is switched from the other battery to the computer main body via the first switching element and the second switching element of the other series circuit. It is a thing.

According to a fourth aspect of the present invention, in the third aspect of the invention, when the voltage of the one battery drops below a predetermined value, one battery is switched to the other battery.

According to a fifth aspect of the present invention, a first switching element whose input side is detachably connected to the first battery and an anode are connected to the input side of the first switching element, and a cathode is the first switching element. A first circuit having a first diode connected to the output side of the first switching element, and an input side connected to the output side of the first switching element and an output side connected to supply power to the computer body. A first circuit comprising a second circuit having a second switching element and a second diode whose cathode is connected to the input side of the second switching element and whose anode is connected to the output side of the second switching element. , A third switching element whose input side is detachably connected to the second battery and an anode are connected to the input side of the third switching element. A third circuit having a third diode whose cathode is connected to the output side of the third switching element, and an input side connected to the output side of the third switching element and an output side of the computer body. A fourth diode having a fourth switching element connected to the power supply site and a fourth diode having a cathode connected to the input side of the fourth switching element and an anode connected to the output side of the fourth switching element; A second series circuit composed of four circuits, a judging means for judging the capacities of the first battery and the second battery, a first switching element and a second switching element, and a third switching element. And turning off the fourth switching element to supply electric power from the first battery to the computer body, and the capacity of the first battery has a predetermined value. When it goes down, the first switching element is turned off, the fourth switching element is turned on, the second switching element is turned off, and the third switching element is turned on in order to supply power from the second battery to the computer main body. And a control means for controlling so as to supply.

According to a sixth aspect of the invention, a first switching element whose input side is detachably connected to the first battery and an anode are connected to the input side of the first switching element and a cathode is the first switching element. A first circuit having a first diode connected to the output side of the first switching element, and an input side connected to the output side of the first switching element and an output side connected to supply power to the computer body. A first circuit comprising a second circuit having a second switching element and a second diode whose cathode is connected to the input side of the second switching element and whose anode is connected to the output side of the second switching element. , A third switching element whose input side is detachably connected to the second battery and an anode are connected to the input side of the third switching element. A third circuit having a third diode whose cathode is connected to the output side of the third switching element, and an input side connected to the output side of the third switching element and an output side of the computer body. A fourth diode having a fourth switching element connected to the power supply site and a fourth diode having a cathode connected to the input side of the fourth switching element and an anode connected to the output side of the fourth switching element; A second series circuit composed of four circuits; and a converter for converting alternating current into direct current connectable to the power supply part of the computer body,
Charging is performed on the basis of the judgment result of the judgment means for judging the charging start conditions of the first battery and the second battery and the converter, and the first battery is fully charged. And the charging start condition of the second battery is satisfied, the first switching element is turned off, the fourth switching element is turned on, and the second switching element is turned on.
And a control means for controlling to start charging of the second battery by sequentially turning off the switching element and turning on the third switching element.

According to a seventh aspect of the invention, the first switching element connectable to the battery on the input side and the anode are connected to the input side of the first switching element, and the cathode is on the output side of the first switching element. First connected
A first circuit including a diode, a second switching element connected at an input side to an output side of the first switching element and connected at an output side so as to supply power to the computer main body, and a cathode. Second series circuit including a second diode connected to the input side of the second switching element and having the anode connected to the output side of the second switching element; and the plurality of series circuits. Detection means for detecting a notice of battery removal, with the battery connected to at least two of the circuits;
When power supply is being supplied from one battery and the advance notice of battery removal is detected, power is supplied to the computer main body from each of the two or more batteries via the first diode. And a control means for controlling the on / off states of the switching element and the second switching element.

[0017]

According to a first aspect of the present invention, there is provided a first circuit having a first switching element and a first diode, an input side is connected to an output side of the first switching element, and an output side is a power source for a computer main body. A plurality of series circuits each including a second circuit including a second switching element and a second diode that are connected to each other to supply the power supply circuit.
The first switching element, the first diode, the second
The switching element and the second diode are connected in parallel. Therefore, by controlling the on / off state of each switching element, a separate battery is connected to each of the first switching elements and the first switching element is connected. The power can be supplied to the computer main body without going through each of the diode and the second diode. Therefore, the loss of power due to the diode can be eliminated and the operation time by battery drive can be lengthened.

In the invention of claim 1, since electric power is not supplied through the diode, in the above example, 60 WH / 1
Since 0W = 6 hours, the operation time can be extended by 0.34 hours (about 20 minutes).

According to a second aspect of the present invention, as in the second aspect of the invention, the drains of a pair of field effect transistors each having a diode are connected to each other, for example, the anode is connected to the source and the cathode is connected to the cathode. The pair of field effect transistors each having a diode connected to the drain can be configured to be connected to each other.

When a pair of series circuits according to the invention of claim 1 is provided and a battery is connected to each of the series circuits, claim 3
In a state in which power is supplied from one battery to the computer main body via the first switching element and the second switching element of the one series circuit,
Power is supplied to the computer main body from both batteries via the first diode, that is, power is supplied in the diode OR state, power supply from one battery to the computer main body is stopped, and power is supplied from the other battery. It can be switched so as to supply power to the computer main body through the first switching element and the second switching element of the other series circuit. This switching can be performed when the voltage of one battery drops below a predetermined value.

By switching the battery as described above, the power supply to the computer main body can be switched without interruption. Further, since the switching at this time is instantaneously performed, the power loss due to the internal diode is negligible.

According to a fifth aspect of the present invention, there is provided a first circuit including a first switching element and a first diode, and a second circuit.
Second switching element and second diode
From a third circuit including a first switching circuit, a third switching element and a third diode, and a fourth circuit including a fourth switching element and a fourth diode. And a second series circuit that is

The control means turns on the first switching element and the second switching element and turns off the third switching element and the fourth switching element to supply electric power from the first battery to the computer main body. This can prevent power loss due to the diode. Further, the control means is configured to turn off the first switching element, turn on the fourth switching element, turn off the second switching element, and turn off the third switching element when the capacity of the first battery becomes equal to or less than a predetermined value. Are sequentially turned on to control so that power is supplied from the second battery to the computer main body. As a result, electric power is supplied to the computer main body through the diode OR state, so that the electric power supply to the computer main body can be switched without interruption.

According to a sixth aspect of the present invention, when the battery is charged by the converter that converts alternating current into direct current, the first battery is fully charged and the charging start condition for the second battery is satisfied. Since the first switching element is turned off, the fourth switching element is turned on, the second switching element is turned off, and the third switching element is turned on to start charging the second battery, the discharge path ( The battery can be charged using the power supply path). In the invention of claim 6, since the power supply path and the charging path are common, the structure can be simplified.

According to the invention of claim 7, when the notice of battery removal is detected while the power is being supplied from one battery, the computer is supplied from each of the two or more batteries via the first diode. Since the on / off states of the first switching element and the second switching element are controlled so that power is supplied to the main body, the diode or state is entered when the notice of battery removal is detected, and battery removal This will prevent the power supply from being stopped.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. The battery connecting device for a computer according to this embodiment includes a first series circuit 26 and a second series circuit 28. The first series circuit 26 includes a field effect transistor (hereinafter referred to as FET) 11 and a FET 12 whose drains D are connected to each other. A power MOSFET can be used as the FET. The second series circuit 28 also includes the FET 21 and the FET 22 in which the drains D are connected to each other, like the first series circuit 26.

Further, FET11, FET12, FET2
Each of 1 and the FET 22 has a built-in internal diode D11, D12, D21, D22 whose cathode is connected to the drain D and whose anode is connected to the source S.

The computer main body of the present embodiment is provided with a battery pack (battery) accommodating portion having a keyboard that can be opened and closed as a lid, and the source S of the FET 11 is provided.
Is connected to a first battery pack 30 which is detachably mounted in a battery pack housing of the notebook computer main body, and a source S of the FET 12 is connected to an input end of a DC / DC converter 32 which supplies electric power to the computer main body. It is connected. The computer main body is provided with a keyboard switch for detecting the open / closed state of the keyboard. Further, the source S of the FET 21 is connected to the second battery pack 34 that is detachably attached to the notebook computer body, and the source S of the FET 22 is connected to the input end of the DC / DC converter 32.

When the keyboard is opened and the first battery pack 30 or the second battery pack 34 is removed from the computer main body, the first series circuit 26 and the first battery pack 30, the second series circuit 28 and the second series circuit 28 are removed. The electrically connected state of the second battery pack 34 is released. Therefore,
The first battery pack 30, the first series circuit 26, the second
The battery pack 34 and the second series circuit 28 are connected so that they can be separated from each other.

Inside the first battery pack 30, the thermistor 30B for detecting the temperature of the first battery cell 30A, the resistances R1, R2, R3 and the first battery cell 30A, that is, the temperature of the first battery pack 30. Is built in. Then, the battery temperature T1 is detected from the voltage between the resistor R1 and the thermistor 30B, and the resistor R2 and the resistor R2 are detected.
The battery voltage V1 is detected from the voltage between 3 and 3. NiMH or the like can be used as the battery cell.

The second battery pack 34 also has the same structure as the first battery pack 30 and has the second battery cell 34.
A, resistors R4, R5, R6, second battery cell 34A
Of the second battery pack 34, that is, the thermistor 34B for detecting the temperature of the second battery pack 34 is incorporated. Also, the first
Similar to the case of the battery pack 30, the battery temperature T2 and the battery voltage V2 are detected from the voltage between the resistor R4 and the thermistor 34B and the voltage between the resistors R5 and R6, respectively.

An AC / DC adapter 36 for converting AC (alternating current) into DC (direct current) is connected via a connector (not shown) provided on the side surface of the computer main body and a diode 40 built in the computer main body. It is connected to the input end of the DC / DC converter 32. This AC / D
The C adapter 36 can be detached from the computer main body at the connector portion.

On the anode side of the diode 40, AC /
A detection circuit 38 that detects the connection state of the DC adapter 36 and outputs a high level signal A when the AC / DC adapter 36 is connected and outputs a low level signal A when the AC / DC adapter 36 is removed. It is connected.

FIG. 3 shows a control device 42 for controlling the switching operation of the FETs 11 to 22.
Each of the output pins P1, P2, P3, P4 is connected so as to input each of the control signals C11, C12, C21, C22 to the gate G of each FET. Further, the input pins I1 and I2 are connected to receive the battery voltage V1 and the battery temperature T1, respectively, and the input pins I4 and I5 are connected.
The battery voltage V2 and the battery temperature T2 are connected to each of the above. The input pin I3 is connected to a keyboard switch as a detection means for detecting a notice of battery removal, and the input pin I6 is connected so that the signal A from the detection circuit 38 is input. This keyboard switch is turned on / off according to the opening / closing of the keyboard. When a lid other than the keyboard is used as the lid of the battery storage unit, a switch that turns on / off according to opening / closing of the lid may be used instead of the keyboard switch. The controller 42 is a DC power supply VCC
And the GND pin is grounded.

FIG. 4 shows the control routine of this embodiment. In step 100, the battery pack is discharged to supply power from the battery pack to the computer main body, and in step 200, the battery pack is charged. In step 300, the process at the time of opening the keyboard, that is, the process at the time of notice of battery pack removal is performed.

FIG. 5 shows the details of the discharging process of the battery pack in step 100. In step 110, it is judged whether or not the AC / DC adapter 36 is connected. When the AC / DC adapter 36 is connected, charging is performed or the power converted by the AC / DC adapter 36 is supplied to the computer main body, so this routine ends.

On the other hand, if it is determined in step 110 that the AC / DC adapter 36 is not connected, one battery is discharged as described below, and the capacity of this battery drops below a predetermined value. Then, the other battery is discharged.

First, in step 112, it is determined whether the battery voltage V1 of the first battery pack 30 is higher than the reference voltage V0. This reference voltage V0 corresponds to the operation stop voltage of the battery, and is for stopping the normal battery discharge when the battery voltage drops below the reference voltage V0. When the battery voltage V1 is higher than the reference voltage V0, discharging is possible, so step 11
In step 4, it is determined whether or not the first battery pack 30 is being discharged. When the first battery pack 30 is being discharged, this routine is ended, and when the first battery pack 30 is not being discharged, a step is executed. 116
As will be described later, the discharge from the first battery pack 30 is started.

If the battery voltage V1 of the first battery pack 30 is less than or equal to the reference voltage V0, that is, if the first battery pack 30 cannot be discharged normally, the battery of the second battery pack 34 is determined in step 118. It is determined whether the voltage V2 is higher than the reference voltage V0.
When the battery voltage V2 is higher than the reference voltage V0, it is determined in step 120 whether the second battery pack 34 is discharged, and the second battery pack 34 is determined.
When discharging from the
If the second battery pack 34 is not discharged, the second battery pack 34 is started to be discharged in step 122 as described later.

When it is determined in step 118 that the battery voltage V2 is equal to or lower than the reference value V0, that is, when the first battery pack 30 and the second battery pack 34 cannot discharge normally, both battery packs are discharged. Since the capacity is equal to or less than the predetermined value, the LED is turned on to display that the remaining battery level is low, and the computer main body is put in the suspend state. In the suspend state, the power is supplied to the memory, the memory controller, and the like, which are the electronic components that require the power supply, and the power is not supplied to the display or the like, which does not require the power supply.

FIG. 6 shows the details of step 116. In step 116A, it is judged whether or not the second battery pack 34 is being discharged. If the second battery pack 34 is not discharging, the second battery pack is not being used when the first battery pack is used, and therefore the controller 42 sends the FE to the FE in step 116E.
Turn on T11, turn on FET12, turn off FET21,
Control signals C11, C12, C2 for turning off the FET 22
1 and C22 are output (FIG. 8). As a result, the first battery pack 30 is discharged and power is supplied to the computer main body. At this time, the first battery pack 30
Since the electric power is supplied without passing through the internal diodes D11 and D12, the electric power loss due to the internal diodes is eliminated. At this time, power is supplied through the FET, but the power loss due to the ON resistance of the FET is negligible as compared with the power loss due to the internal diode. Further, the power from the second battery pack is blocked by the diode D22 (when V2> V1 as shown in FIG. 8) or the diode D21 (when V1> V2 as shown in FIG. 16).

In step 116A, the second battery pack 3
If it is determined that the battery is being discharged, FET 11 and FET
Since 12 is off and FET21 and FET22 are on (FIG. 12), FET21 is turned off in step 116B. At this time, the control signal from the controller 42 is
C11 = OFF, C12 = OFF, C21 = OFF, C22 =
Is on. As a result, electric power is supplied from the second battery pack 34 via the internal diode D21 and the drain / source of the FET 22 (FIG. 11).

At the next step 116C, the FET 12 is turned on. At this time, the control signal is C11 = OFF, C
12 = on, C21 = off, C22 = on. As a result, the first battery pack 30 and the second battery pack 34 are in a diode-or state with respect to the DC / DC converter 32, and power is supplied from the first battery pack 30 via the internal diode D11 and the drain / source of the FET 12. Is supplied, and power is supplied from the second battery pack 34 via the internal diode D21 and the drain / source of the FET 22 (FIG. 10).

At the next step 116D, the FET 22 is turned off. The control signal at this time is C11 = OFF, C =
12 on, C = 21 off, C = 22 off. As a result, the power from the second battery pack 34 is blocked by the internal diode D22, and the first battery pack 30
Only the power from And step 116
At E, the FET 11 is turned on. This makes the first
Power from the battery pack 30 is supplied between the source and drain of the FET 11 and between the drain and source of the FET 12, and does not pass through the internal diode of the FET 11 and the internal diode of the FET 12.

FIG. 7 shows the details of step 122. In step 122A, the first battery pack 3 is
It is determined whether 0 is being discharged. First battery pack 30
If is not discharging, then in step 122E, F
ET11 is turned on, FET12 is turned on, FET21 is turned off, and FET22 is turned off (FIG. 12). As a result, the power from the second battery pack 34 is transferred to the internal diode D.
Since it is supplied to the computer main body without going through 21, D22, there is no power loss due to the internal diode.

If it is determined in step 122A that the first battery is being discharged, the FET 11 is turned off in step 122B and the FE is detected in step 122C.
Turn on T22 (diode OR state), step 12
The FET 12 is turned off in 2D and the FET 21 is turned on in step 122E. Control device 4 at this time
The control signals from No. 2 are shown in steps 122B to 122E of FIG. 8 to 12 show the battery switching state according to FIG. 7. FIG. 8 shows a state during discharging of the first battery pack, and FIG. 9 shows steps 122B and 10B.
Is step 122C, FIG. 11 is step 122D, and FIG.
2 corresponds to step 122E.

As described above, from the second battery pack to the first
By switching to the battery pack or from the first battery pack to the second battery pack, it is possible to switch the battery pack without interruption of power supply to the computer main body. Further, since the switching at this time is instantaneously performed, the power loss due to the internal diode is negligible.

FIG. 13 shows the details of step 200. In step 210, it is judged whether or not the AC / DC adapter 36 is connected. When the AC / DC adapter 36 is not connected, charging cannot be performed, so this routine is ended.

On the other hand, if it is determined in step 210 that the AC / DC adapter 36 is connected, one battery is charged as described below, and when this battery is fully charged, the other battery is charged. Charge.

First, in step 212, it is determined whether or not the charging start condition for the second battery pack 34 is satisfied. The charging start condition is that the battery temperature is within a predetermined range (for example, 5 ° C. <battery temperature <43 ° C.) and the battery voltage is equal to or lower than the battery charging start voltage (which may be the same value as the reference voltage V0). The conditions are adopted, and when this condition is satisfied, the charging start condition is satisfied.

When it is determined that the condition for starting the charging of the second battery pack 34 is satisfied, the charging is started in step 214 as described later, and the second battery pack 3 is started.
If the charge start condition of No. 4 is not satisfied, it is determined in step 216 whether or not the charge start condition of the first battery pack 30 is satisfied by adopting the same condition as above.
When the charging start condition of the first battery pack 30 is satisfied, charging is started in step 218 as described later.

In step 220, the second battery pack 3
No. 4, it is determined whether the battery is being charged, and if it is being charged, it is determined in step 222 whether the battery is fully charged. Whether or not the battery is fully charged can be determined by the rise in battery temperature from the start of charging or the battery temperature.
When the battery temperature rises by a predetermined value (for example, 22 ° C.) or more from the start of charging, or when the battery temperature reaches a predetermined value (for example, 60 ° C.), it is determined that the battery is fully charged.

When the battery is fully charged, step 224
Outputs the control signal C21 of OFF to the gate at
By turning off T21, the charging of the second battery pack 34 is stopped. On the other hand, when it is determined in step 220 that the second battery pack 34 is not being charged, it is determined in step 226 whether the first battery pack 30 is being charged, and if the first battery pack 30 is being charged, In step 228, it is determined whether or not the battery is fully charged by determining the same conditions as above, and in the case of fully charging, the control signal C11 for turning off is output to the gate in step 230, and the FET 11 is turned off. The charging of the battery pack 30 is stopped.

FIG. 16 shows a state in which electric power is being supplied from the first battery pack 30, and in this state AD
When the / DC adapter 36 is connected and the charging start condition of the first battery pack 30 is satisfied, the charging of the first battery pack 30 is started (step 218) as shown in FIG. As shown in 18,
Charging of the first battery pack 30 is stopped (step 230).

FIG. 14 shows details of step 214 for charging the second battery pack. When the charging condition of the second battery pack 34 is satisfied, the charging of the first battery pack 30 is completed, the FET 11 is turned off, and the FE
T12 is on, FET21 is off, and FET22 is on (FIG. 18). Therefore, step 21
4A, the FET 22 is turned on (FIG. 19), the FET 12 is turned off at step 214B (FIG. 20), and the FET 21 is turned on at step 214C (FIG. 2).
1). As a result, the charging of the second battery pack 34 is started. Note that steps 214A to 214C in FIG. 16 are shown by turning on / off the control signals C11 to C22 to the respective gates.

FIG. 15 shows the details of step 218 for charging the first battery pack. When the charging of the second battery is stopped at step 224, FET11 is off, FET12 is off, FET21 is off, and FET2 is
2 is on. Therefore, step 21
The FET 12 is turned on at 8A, the FET 22 is turned off at step 218B, and the FET 11 is turned on at step 218C.

As described above, since the charging / discharging is performed with the power supply path and the charging path in common, the structure of the battery connecting device can be simplified.

FIG. 22 shows the details of step 300. In step 310, it is judged based on the signal from the keyboard switch whether the keyboard is opened, that is, whether the removal of the battery is foretold. When the keyboard is opened, the removal of the battery has been informed in advance, so in step 312, the first battery pack 30 and the second battery pack 34 are brought into the diode-or state with respect to the DC / DC converter 32. That is, when power is being supplied by the first battery pack 30, the FET 11 is turned off and the FET 22 is turned on. When the second battery pack 34 is supplying electric power, the FET 21 is turned off and the FET 12 is turned off.
Turn on. As a result, no matter which battery is removed, power is supplied from the remaining batteries. At this time, electric power is supplied through the diode, but since the time until the battery is removed and a new battery is attached is short, power loss can be small.

Then, in step 314, it is judged whether or not the keyboard is closed, and when the keyboard is closed, this routine is ended.

Although an example in which a battery is connected to each of the two series circuits has been described above, three series circuits are used.
The battery may be connected to each of the above. Further, although the example in which the FET is used as the switching element has been described, other switching elements such as a transistor and a relay can be used. Further, in the above description, it is detected that the removal of the battery is notified by opening the keyboard, but it is also possible to detect that the capacity of one of the batteries has become less than or equal to a predetermined value and detect the notification of removal of the battery. .

In the above description, an example using an FET having a diode in which the anode is connected to the source and the cathode is connected to the drain has been described, but the present invention is not limited to this, and the cathode is the source. Connected FETs can also be used.

[0062]

As described above, according to the inventions of claims 1 to 4, it is possible to obtain the effect that the loss of electric power due to the diode can be eliminated and the operation time by battery drive can be lengthened.

According to the invention of claim 5, it is possible to prolong the operation time by the battery drive, and to switch the discharge of the battery without stopping the supply of the electric power when the capacity of one battery decreases. The effect of, is obtained.

According to the invention of claim 6, since the power supply path and the charging path are common, the structure can be simplified and the battery charging can be switched smoothly. To be

Further, according to the invention of claim 7, the diode OR state is set when the battery removal notice is detected, so that the operation time by the battery drive can be extended and the battery removal can be performed. It is possible to obtain the effect of preventing the power supply from being stopped.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a conventional battery connecting device for a computer.

FIG. 2 is a circuit diagram of a battery connecting device for a computer according to the present embodiment.

FIG. 3 is a block diagram of a control device for on / off controlling the FET of FIG.

FIG. 4 is a flow chart showing a charge / discharge processing routine of the present embodiment.

5 is a flow chart showing details of step 100 of FIG.

FIG. 6 is a flow chart showing details of step 116 of FIG.

FIG. 7 is a flowchart showing details of step 122 of FIG.

FIG. 8 is a schematic diagram showing a state in which electric power is being supplied from the first battery.

FIG. 9 is a schematic diagram showing a state showing supply of electric power via an internal diode D11.

FIG. 10 is a schematic diagram showing a diode OR state.

FIG. 11 is a schematic diagram showing a state in which electric power is supplied via an internal diode D21.

FIG. 12 is a schematic diagram showing a state in which electric power is being supplied from a second battery.

13 is a flow chart showing details of step 200 of FIG.

FIG. 14 is a flow chart showing details of step 214 of FIG.

FIG. 15 is a flow chart showing details of step 218 of FIG.

FIG. 16 is a schematic diagram showing a state in which electric power is being supplied from the first battery.

FIG. 17 is a schematic diagram showing a state in which an AC / DC converter is connected from the state of FIG.

18 is a schematic diagram showing a state in which the FET 11 is turned off from the state of FIG.

FIG. 19 is a schematic diagram showing a state in which the FET 22 is turned on from the state of FIG.

20 is a schematic diagram showing a state in which the FET 12 is turned off from the state of FIG.

21 is a schematic diagram showing a state in which the FET 21 is turned off from the state of FIG.

FIG. 22 is a flow chart showing details of step 300 of FIG.

[Explanation of symbols]

 26 1st series circuit 28 2nd series circuit 30 1st battery pack 34 2nd battery pack 42 Control device

Claims (7)

[Claims] 1. A first diode whose input side is connectable to a battery and whose anode is connected to the input side of the first switching element and whose cathode is connected to the output side of the first switching element. And a second switching element and a cathode connected to the output side of the first switching element and connected to the output side to supply power to the computer body.
A second battery having a second diode connected to the input side of the switching element and having an anode connected to the output side of the second switching element, and a battery connection for a computer having a plurality of series circuits including apparatus. 2. A battery connecting device for a computer, comprising a plurality of series circuits each connectable to a separate battery for supplying electric power to the computer main body, wherein the series circuits each include a pair of diodes. A battery connecting device for a computer, comprising: the drains of the field-effect transistors connected to each other. 3. A first diode whose input side is connectable to a battery and whose anode is connected to the input side of the first switching element and whose cathode is connected to the output side of the first switching element. And a second switching element and a cathode connected to the output side of the first switching element and connected to the output side to supply power to the computer body.
A second battery having a second diode connected to the input side of the switching element and having an anode connected to the output side of the second switching element; A battery switching method, in which a battery is connected to each of the series circuits of the connection device, and one battery is switched to the other battery, wherein the first switching element and the second switching element of one series circuit are switched from one battery. Power is supplied to the computer main body from both batteries via the first diodes, respectively, while power is supplied to the computer main body via the first diode, and the supply of power from the one battery to the computer main body is stopped, And from the other battery via the first switching element and the second switching element of the other series circuit, Switching method of a battery for switching to supply power to computer body. 4. The battery switching method according to claim 3, wherein when one of the batteries has a voltage lower than a predetermined value, the one battery is switched to the other battery. 5. A first switching element whose input side is detachably connected to the first battery and an anode are connected to the input side of the first switching element, and a cathode is connected to the output side of the first switching element. And a second circuit having an input side connected to an output side of the first switching element and an output side connected to supply power to the computer body. And a second diode having a cathode connected to the input side of the second switching element and an anode connected to the output side of the second switching element; The third side whose input side is detachably connected to the second battery
A switching element and a third diode whose anode is connected to the input side of the third switching element and whose cathode is connected to the output side of the third switching element; and the input side is the third circuit. A fourth switching element connected to the output side of the switching element 3 and the output side of which is connected to the power supply part of the computer body, the cathode is connected to the input side of the fourth switching element, and the anode is the fourth switching element. A second series circuit including a fourth circuit including a fourth diode connected to the output side of the first battery, a determination unit that determines the capacities of the first battery and the second battery, and a first switching circuit. Turning on the element and the second switching element and turning off the third switching element and the fourth switching element to disconnect the first battery from the first battery. While supplying electric power to the computer main body, when the capacity of the first battery becomes equal to or less than a predetermined value, the first switching element is turned off, the fourth switching element is turned on, the second switching element is turned off, and the third switching element is turned on. A battery connecting device for a computer, comprising: a control unit that sequentially turns on the switching elements of 1 to control so that power is supplied from the second battery to the computer body. 6. A first switching element, the input side of which is detachably connected to the first battery, and the anode of which is connected to the input side of the first switching element, and the cathode of which is connected to the output side of the first switching element. And a second circuit having an input side connected to an output side of the first switching element and an output side connected to supply power to the computer body. And a second diode having a cathode connected to the input side of the second switching element and an anode connected to the output side of the second switching element; The third side whose input side is detachably connected to the second battery
A switching element and a third diode whose anode is connected to the input side of the third switching element and whose cathode is connected to the output side of the third switching element; and the input side is the third circuit. A fourth switching element connected to the output side of the switching element 3 and the output side of which is connected to the power supply part of the computer body, the cathode is connected to the input side of the fourth switching element, and the anode is the fourth switching element. A second series circuit including a fourth circuit having a fourth diode connected to the output side of the computer, a converter connectable to the power supply part of the computer body for converting alternating current into direct current, and Determining means for determining charging start conditions of the battery and the second battery, and the determining means of the determining means when the converter is connected. The charging is performed based on the disconnection result, and when the first battery is fully charged and the charging start condition of the second battery is satisfied, the first switching element is turned off, the fourth switching element is turned on, A battery connecting device for a computer, comprising: a control unit that sequentially controls turning off of the second switching element and turning on of the third switching element to start charging of the second battery. 7. A first diode whose input side is connectable to a battery and whose anode is connected to the input side of the first switching element and whose cathode is connected to the output side of the first switching element. And a second switching element and a cathode connected to the output side of the first switching element and connected to the output side so as to supply power to the computer main body. A plurality of series circuits including a second circuit having a second diode connected to the input side of the switching element and having an anode connected to the output side of the second switching element; With at least two batteries connected, a detection means for detecting a notice of battery removal, and a state where power is supplied from one battery The on / off state of the first switching element and the second switching element so that power is supplied from each of the two or more batteries to the computer main body through the first diode when the advance notice of battery removal is detected by A battery connecting device for a computer, including: